Three small short stories, each of which was created by one of the famous Czechoslovak filmmakers of children's films: Magdalena, Fraud and Karp.

The holiday story revolves around the children of editor Hlavsa and their desire to get a dog. Dad bravely faces his children's wish and all he cares about is the dreamed summer peace. However, the editor's unexpectedly requested regular feature stories from the children's lives change everything. The uproar in the pages of the newspaper and the children's determination not to give up on their dream leads to the hope that something four-legged might eventually turn up at the Hlavs' after all.

A modern fairy tale that takes place in the present.

It is the summer holiday and little Mísa Horák has taken a few animals from the school's so-called "Corner of Living Nature" home to care for. But when he brings home two Angora rabbits, a starling, a little monkey, a tortoise and a small crocodile, his parents order him to take them away. He is helped by Káta, who offers to place the animals in the child's room of her family's apartment. Mísa leaves for her friend where the animals will hopefully be able to stay. Káta goes shopping. In the meantime, Káta's younger sister Minka wakes up and begins to play with the animals, who gradually run off in disarray.

The series of children's films about Detective Martin, who intervenes in cases involving children, begins with this film. It consists of two short stories: in the first ("Three Bottles"), the young hero, escaping from an orphanage, gets involved in a robbery of postage stamps..., in the second ("Flying Carousel"), the children fight a dishonest owner of fairground rides...

It is the 1930s. Physician Bartos devotedly attends poor patients in the city suburbs, at the same time researching the possibilities of regeneration of human tissues after transplantation. His former colleague Rosen, now working as an assistant at the private clinic of surgeon Kirchenbruch, considers the research a mere utopia. The disappointed Bartos, trying to verify his theories, therefore accepts the outrageous proposal of Marion, owner of a brothel - to surgically replace the face of her lover, the wanted thief Cutter, with the face of murdered Father Hopsasa. Bartos is well paid but his successful operation remains a secret.

The Karpísek married couple, both doctors, are leaving for London for two months on business. They entrust their five-year old son Jozánek to the care of their neighbor, Mrs Pokorná.

Children's detective stories were very successful in the 1960s, and the stories of Martin the criminal even had several sequels. In this film, Martin investigates a mysterious ancient crime in a castle where today the guide mentions this fact only as a curiosity. He is led to this by a broken display case on which he finds a child's handprints. And in a seemingly mundane red slide, easily mistaken for a rare diamond, he finds an important clue...

Captain Martin from the police's child department and his colleague Kraus are called to Znojmo to help solve a case regarding stolen toys found in the town's subterranean passages. The members of the local police department are convinced that the thieves are the well-known "customers" from the Znojmo elementary school, pupils Exner and Mandlík. Martin, however, has doubts about these culprits. These doubts grow even stronger after the local self-service shop is robbed and the local tobacco store reports that it is missing a lot of imported cigarettes. Martin questions the children, inspects both shops and searches through the underground.

The second installment of children's stories investigator Dr. Martin. The film has two stories: